JP2019206121A - Tread transfer - Google Patents

Abstract

To prevent misalignment when receiving a tread member from a drum.SOLUTION: Gripping means 11 for gripping a tread member A from the outer peripheral surface side includes a plurality of segments 15 spaced in a circumferential direction. Each segment 15 has a contact surface portion 15S capable of contacting an outer peripheral surface As of the tread member A by a radially inward movement. One protrusion 28 protruding radially inward is provided on the contact surface portion 15S.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tread transfer capable of preventing a positional deviation when a cylindrical tread member formed on a drum is received from the drum.

  In Patent Document 1 below, a cylindrical tread member (so-called tread ring) received from a drum is conveyed to a tread application position on the radially outer side of a cylindrical raw tire base held by a shaping former, and this A tread transfer that holds a tread member at a tread application position is described.

  The tread transfer includes a tread holding ring that abuts on the outer peripheral surface of the tread member and grips the tread member concentrically by reducing the inner peripheral surface.

  However, in the case of this tread transfer, when the tread member is received from the drum, there is a problem that a deviation in the tire axial direction is likely to occur between the tread member and the tread holding ring, and the formation accuracy of the raw tire is reduced. Specifically, the diameter of the tread holding ring is reduced, and the tread member formed on the drum is gripped from the outer peripheral surface side. In this gripping, the diameter of the drum is reduced and the tread member is separated from the drum. However, at this time, the tread member is slightly reduced in diameter with the reduction in the diameter of the drum and is easily deformed. As a result, the grip by the tread holding ring is loosened, and the tread member is displaced.

JP 2012-236392 A

  Therefore, an object of the present invention is to provide a tread transfer that can prevent displacement when receiving a tread member from a drum.

The present invention is a tread transfer comprising a gripping means for gripping a cylindrical tread member from its outer peripheral surface side,
The gripping means includes a plurality of segments having contact surface portions that are spaced apart in the circumferential direction and that can contact the outer peripheral surface of the tread member by moving inward in the radial direction, and the contact surface portions of each segment In addition, one protruding portion protruding radially inward is provided.

  In the tread transfer according to the present invention, it is preferable that the protrusion has a conical shape or a pyramid shape.

  In the tread transfer according to the present invention, it is preferable that the protrusion is disposed at a centroid position of the contact surface portion.

In the tread transfer according to the present invention, the gripping means includes expansion / contraction diameter means for moving the segments inward and outward in the radial direction,
The expansion / contraction diameter means includes a rack-shaped support shaft extending radially outward from each of the segments and having a tooth groove portion on one side surface, and is supported so as to be rotatable around an axis and having a tooth groove portion on an inner peripheral surface thereof. And a connecting gear that meshes with a tooth groove portion of the rotating ring and a tooth groove portion of the support shaft.

  In the tread transfer according to the present invention, it is preferable that the tread transfer further includes an imaging unit for inspecting a positional deviation in the axial direction between the tread member and the gripping unit.

  In the present invention, the gripping means grips the tread member from the outer peripheral surface side by the contact surface portion of each segment contacting the outer peripheral surface of the tread member. At this time, the protruding portion protruding from the contact surface portion is bitten into the tread member.

  Therefore, even when the tread member is reduced in diameter and easily deformed with the separation of the drum after gripping, it is possible to prevent the tread member from being displaced due to the protrusions.

It is a side view which shows notionally a part of production line of the green tire using the tread transfer of this invention. It is a front view of a tread transfer. It is a perspective view which shows an example of an expansion-contraction diameter means externally. It is a rear view of a tread transfer. It is sectional drawing which shows the effect of this invention. It is a perspective view which shows an example of an imaging means externally.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 shows a part of a raw tire production line. This production line is a tread forming drum 2 that forms a cylindrical tread member A, and a shaping that expands a raw tire base B from a cylindrical shape to a toroidal shape. A former 3 and a tread transfer 1 that can reciprocate between the drum 2 and the shaping former 3 are provided.

  In the production line, the tread transfer 1 is used to convey the tread member A received from the drum 2 to the tread application position Q on the radially outer side of the cylindrical raw tire base B held by the shaping former 3, and this tread. The tread member A is held at the sticking position Q and waits. Thereafter, the raw tire base B is expanded in a toroidal shape by the shaping former 3, and the expanded portion is pressed against the inner peripheral surface of the tread member A to be integrally joined to form a raw tire.

  The drum 2 has a well-known structure capable of expanding and contracting, and a tread member A is formed by sequentially laminating tread components including, for example, a belt ply and tread rubber.

  The shaping former 3 has a known structure and holds a cylindrical raw tire base B. The shaping former 3 may be a second former used in a so-called second stage forming method in which a green tire base B formed separately on a band drum is held, and the raw tire base B is formed on the shaping former 3. It may be a former used in a so-called single stage forming method for directly forming the film. The green tire base B is formed by sequentially laminating tire components including, for example, an inner liner rubber, a carcass ply, a bead core, a bead apex rubber, a sidewall rubber, and the like.

  The tread transfer 1 includes gripping means 11 for gripping the tread member A from the outer peripheral surface As side.

  The tread transfer 1 of this example includes a moving means 10 that can reciprocate between the drum 2 and the shaping former 3, and an outer peripheral surface of the tread member A that is supported by the moving means 10 and the inner peripheral surface 11S is reduced in diameter. And gripping means 11 that abuts on As and grips the tread member A concentrically.

  Specifically, as shown in FIG. 2, the moving means 10 includes, for example, a moving table 10A that can travel along the guide rail 12, and a ring-shaped frame 10B that is erected on the moving table 10A. Yeah. The frame 10B of this example includes a ring-shaped main body 10B1 and side plates 10B2 disposed on both side surfaces thereof. The frame 10B is arranged concentrically with the drum 2 and the shaping former 3.

  The gripping means 11 includes a plurality of segments 15 spaced in the circumferential direction, and an expansion / contraction diameter means 17 for moving each segment 15 in and out in the radial direction.

  Each segment 15 has an arcuate contact surface portion 15S that can contact the outer peripheral surface As of the tread member A by the radially inward movement by the expansion / contraction diameter means 17. The segment 15 of this example is formed in, for example, a split piece shape obtained by dividing the ring-shaped body in the circumferential direction, and each segment 15 cooperates to form a ring-shaped body whose inner peripheral surface 11S can expand and contract. The contact surface portion 15S cooperates to form the inner peripheral surface 11S.

  As shown in FIGS. 2 and 3, the expansion / contraction diameter means 17 includes a support shaft 18, a rotating ring 19, and a connecting gear 20 in this example.

  The support shaft 18 extends radially outward from each segment 15. The support shaft 18 has a rack shape in which a tooth groove portion 18a is provided on one side surface thereof. The frame 10B is provided with a plurality of insertion holes 21 through which the support shafts 18 pass.

  The rotating ring 19 has an internal gear shape having a tooth groove portion 19a on the inner peripheral surface, and is supported so as to be rotatable around an axis concentric with the frame 10B. In this example, the rotating ring 19 is slidably supported on the inner peripheral surface of the ring-shaped main body 10B1.

  The connecting gear 20 meshes with the tooth groove portion 19 a of the rotating ring 19 and the tooth groove portion 18 a of the support shaft 18. Therefore, when the rotating ring 19 is rotated, the segments 15 can be moved inward and outward in the radial direction via the connecting gear 20 and the support shaft 18. The support shaft 18 is preferably disposed on the radially outer surface of the segment 15 and at the centroid position thereof.

  The expansion / contraction diameter means 17 further includes a driving tool 23 that drives the rotating ring 19. In this example, the driving tool 23 includes a cylinder 23A that is attached to the frame 10B. A lever portion 24 projects from the outer peripheral surface of the rotating ring 19, and the rod end of the cylinder 23 </ b> A is connected to the tip portion of the lever portion 24. Therefore, the rotating ring 19 can be rotated at a predetermined angle by the expansion and contraction operation of the cylinder 23A. Reference numeral 25 denotes a cutout portion of the frame 10B through which the lever portion 24 passes.

  In this example, a guide 26 for further stably moving each segment 15 in the radial direction is further provided. The guide 26 includes a guide shaft 26A extending from each segment 15 in parallel with the support shaft 18 and a guide portion 26B for slidably guiding each guide shaft 26A. The guide portion 26B is fixed to the side surface (side plate 10B2) of the frame 10B.

  As shown in FIG. 5 (A), one protrusion 28 protruding inward in the radial direction is formed on the contact surface 15S of each segment 15. When the contact surface portion 15S of each segment 15 contacts the outer peripheral surface As of the tread member A and grips the tread member A, the protrusion 28 is bitten into the outer peripheral surface As.

  Therefore, as shown in FIG. 5 (B), when the tread member A is reduced in diameter and easily deformed with the separation of the drum 2 after being gripped, the protruding portion 28 bites into the tread member. A displacement of A can be prevented.

  Note that the protrusion 28 is preferably formed in a conical shape or a pyramid shape having a sharp tip in order to easily bite into the outer peripheral surface As. Moreover, it is preferable that the protrusion part 28 protrudes in the position of the centroid of the contact surface part 15S. In particular, it is more preferable that the support shaft 18 is arranged in a straight line.

  The protrusion height H of the protrusion 28 from the contact surface portion 15S is preferably 2 mm or more, and more preferably 4 mm or more from the viewpoint of preventing displacement. In order not to affect the roundness of the tread member A, it is preferable to set it to 10 mm or less.

  In the tread transfer 1, it is also preferable to increase the gripping force to the tread member A by moving the segments 15 further in the radial direction in synchronization with the separation of the drum 2. That is, the movement of each segment 15 inward in the radial direction is performed in synchronism with the first movement Y1 (shown in FIG. 5A) for gripping the tread member A on the drum 2 and the separation of the drum 2. The second movement Y2 (shown in FIG. 5B) is preferably performed in two stages.

  The tread transfer 1 of the present example further includes an imaging unit 30 for inspecting the axial misalignment between the tread member A and the gripping unit 11 when the tread member A is gripped.

  As shown in FIG. 6, a camera (including a video camera) 30 </ b> A that captures a positioning marking 31 formed on the outer peripheral surface As of the tread member A can be suitably used for the imaging unit 30.

  The marking 31 is formed as a circumferential line extending along the equator (width center) of the tread member A. Further, the imaging unit 30 extracts the marking 31 from the captured image, and detects, for example, a positional deviation in the axial direction between the position of the projection 28 and the position of the marking 31. When there is no displacement, the tread member A can be gripped with high accuracy by operating the expansion / contraction diameter means 17. When a position shift is detected, the moving table 10A is operated and the tread transfer 1 is moved to a position where the position shift is eliminated.

  In this example, the imaging means 30 is attached to the frame 10B, as shown in FIG. 2, and the outer peripheral surface of the tread member A from the gap D between the segments 15 and 15 in the expanded diameter state in which the segment 15 moves radially outward. As, especially the marking 31 is photographed.

  The tread transfer 1 is provided with stitch means 33 (shown in FIG. 4) on both sides thereof. As is well known, the stitching means 33 presses the axially opposite side portions of the tread member A against the inflated portion of the raw tire base B during shaping, thereby joining the entire tread member A to the raw tire base B.

  FIG. 4 shows stitch means 33 arranged on one side of the tread transfer 1. In FIG. 2, the stitching means 33 is omitted. As shown in FIG. 4, the stitch means 33 includes first stitch means 34 attached to the side surface (side plate 10B2) of the frame 10B and second stitch means 35 attached to the movable table 10A.

  The first stitch means 34 includes a cylinder 34A having a rod that can be expanded and contracted radially inward and outward, and a stitch roller 34B that is rotatably supported at the end of the rod. In this example, the three first stitch means 34 are arranged at different positions in the circumferential direction.

  The second stitching unit 35 includes a cylinder 35A supported by a movable table 36 that is movable in the axial direction, and a stitch roller 35B that is rotatably supported at the rod end. The rod of the cylinder 35A can expand and contract radially inward and outward.

  In the first stitch means 34, the root portion of the protruding portion of the tread member A from the frame 10B is firmly pressed and joined to the raw tire base B. In the second stitching means 35, the stitch roller 35B moves outward in the axial direction, and the protruding portion is pressed against the raw tire base B from the root portion toward the outer end in the axial direction.

  As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.

DESCRIPTION OF SYMBOLS 1 Tread transfer 11 Holding means 15 Segment 15S Abutting surface part 17 Expansion / contraction diameter means 18 Support shaft 18a Tooth groove part 19 Rotating ring 19a Tooth groove part 20 Connection gear 28 Projection part 30 Imaging means A Tread member As Outer surface

Claims (5)

A tread transfer comprising a gripping means for gripping a cylindrical tread member from its outer peripheral surface side,
The gripping means includes a plurality of segments having contact surface portions that are spaced apart in the circumferential direction and that can contact the outer peripheral surface of the tread member by moving inward in the radial direction, and the contact surface portions of each segment In addition, a tread transfer provided with one protrusion protruding radially inward.   The tread transfer according to claim 1, wherein the protrusion has a conical shape or a pyramid shape.   The tread transfer according to claim 1, wherein the protrusion is arranged at a position of a centroid of the contact surface portion. The gripping means includes expansion / contraction diameter means for moving the segments inward and outward in the radial direction,
The expansion / contraction diameter means includes a rack-shaped support shaft extending radially outward from each of the segments and having a tooth groove portion on one side surface, and is supported so as to be rotatable around an axis and having a tooth groove portion on an inner peripheral surface thereof. The tread transfer according to any one of claims 1 to 3, further comprising a connection gear that meshes with a tooth groove portion of the rotating ring and a tooth groove portion of the support shaft.   The tread transfer according to any one of claims 1 to 4, further comprising an imaging unit for inspecting an axial misalignment between the tread member and the gripping unit.

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